Dust on furniture may be bad news for waistlines  . But it's far too early to add dusting to a weight-loss plan. Dietary fats and other materials that make up indoor dust can send a signal to human fat cells, telling them to grow. That process, in turn, might slow the body's rate of burning energy. Such changes could add to any weight problems a person might have. "We don't know what that means to long-term health and certain diseases yet," says Heather Stapleton, one of the study's authors. But she notes that her team's findings also raise a question of whether pollutants in dust might play some role in the growing, global problem of obesity  . Stapleton and her colleagues collected dust from homes and offices. Studies found that some materials in the dust could turn on a protein   called PPAR-gamma 1. It's found in many human tissues. Turning this protein on can cause fat cells to grow. Researchers think this protein may be involved in obesity. But a second study now finds evidence that certain fats are mostly to blame. Cooking oils may send out some of these fats into the air, where they eventually find their way into house dust. Or, the authors say, the fats might enter house dust as part of the hair or skin cells shed   by people or pets. "While the findings are amazing," says Mitchell Lazar, another study author, "these findings need to be taken as very limited." Indeed, he adds several cautions about how the findings should be understood. "For one thing, people eat these fats in foods all of the time. That is likely to be a lot more than would be consumed from indoor dust," he said. What do we know about PPAR-gamma 1?   _ A) It comes from dust. B) It leads to weight gain. C) It can help get rid of dust. D) It only appears in human bodies.
B
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Do we think only with the brain? Hardly. The brain is like a telephone exchange. It is the switchboard, but not the whole system. Its function is to receive incoming signals, make proper connections, and send the messages through to their destination. For efficient service, the body must function as a whole. But where is the "mind"? Is it in the brain or perhaps in the nervous system? After all, can we say that the mind is in any particular place? It is not a thing, like a leg, or even the brain. It is a function, an activity. Aristotle, twenty-three hundred years ago, observed that the mind was to the body what cutting was to the ax. When the ax is not in use, there is no cutting. So it is with the mind. "Mind," said Charles H. Woolbert, "is what the body is doing." If this activity is necessary for thinking, it is also necessary for carrying thought from one person to another. Observe how people go about the business of ordinary conversation. If you have never done this carefully, you have a surprise in store, for good conversationalists are almost constantly in motion. Their heads are continually nodding and shaking sometimes so vigorously that you wonder how their necks can stand the strain. Even the legs and feet are active. As for the hands and arms, they are seldom still for more than a few seconds at a time. These people, remember, are not making speeches. They are only common people trying to make others understand what they have in mind. They are not conscious of movement. Their speech is not studies. They are just human creatures in a human environment, trying to adapt themselves to a social situation. Yet they converse, not only with oral language, but with visible actions that involve practically every muscle in the body. In short, because people really think all over, a speaker must talk all over if he succeeds in making people think. It can be inferred that the basic function of bodily activity in speech is to    . A) make the listener feel emotional B) make the description vivid C) intensify the speaker's spoken words D) carry the speaker's implied meaning to the listener
C
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London's Chinese community   dates back to the 18th century, when a small number of Chinese sailors   moved to the city to work in Lime house, east London. As time went on, other Chinese people came to this area and Lime house began to be known as "Chinatown". At the start of the 20th century, there were just 545 Chinese people in Britain. However, this situation changed greatly after the Second World War. At this time, many farmers in Hong Kong lost their jobs, and decided to move to London. In the 1950s, a small Chinese restaurant opened in central London. Many British people visited it and said that Chinese food was wonderful. Suddenly, Chinese restaurants started opening in every part of the city. Instead of too little work, the new Chinese immigrants   now found that they had too much. Most of the new immigrants enjoyed their life and the chances they were offered. Many asked their friends and relatives to join them from their hometowns, and a lot of families were reunited again at this time. As time went by, London's Chinese community became more and more successful. The sons and daughters of the first restaurant workers, encouraged by their parents, studied very hard at school and university. And most of them could get highly-paid jobs. As a result, increasing numbers of Chinese families left Chinatown and moved to the more expensive places. Chinatown, however, is still as lively as ever, and a must see place for every visitor to London. According to the passage, now most of the Chinese living in London   _  . A) are clever B) work long hours C) have highly-paid jobs D) live an unhappy life
C
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During the seasons of fine weather, kids can play outside, happy and active. But when winter comes around, it is wet, windy and cold. Since they can't go outside to play, kids get restless and miserable. Fun activities for kids are pretty much necessary at that time of year, and they need to be kept entertained. One way to do this is to have an indoor treasure hunt, where children can look for clues and then get to the treasure. Treasure doesn't even need to be much, because just the activity is fun enough. Art activities are always fun, and if you start off with some paper in different colors they can draws shapes on the back, cut them out and stick them on the white paper to make all sorts of things. Cardboard boxes, stuck together and then painted, can be made into buildings or robots. You can keep all boxes in a bag in the loft. Then you have something you can draw on when the weather is bad and the children need to play indoors. Dressing up is another fun indoor activity. Why not read a book to them and then ask them to act it for you? That can keep them busy and develop their imagination. When you encourage children to use their imagination, you are giving them confidence in themselves, in their own creative abilities; by suggesting they put on a play you are encouraging them to work together and develop teamwork skills. The best way to help your kids have fun when it is rainy outside is to let them come up with some ideas. When you feel that they are old enough, let them write their ideas on a piece of paper and you can pick an idea that you find practical. That way, every day can be fun! Kids are most likely to be unhappy in winter because  _  . A) it is very cold and windy B) they lead a miserable life C) they like spring very much D) they can't enjoy themselves outside

D
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